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27d=2d-20
We move all terms to the left:
27d-(2d-20)=0
We get rid of parentheses
27d-2d+20=0
We add all the numbers together, and all the variables
25d+20=0
We move all terms containing d to the left, all other terms to the right
25d=-20
d=-20/25
d=-4/5
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